.root{
    -fx-background-insets: 600; /*背景的外边距*/
}

#exit{/*默认*/
    -fx-background-color: Transparent/*透明*/
    -fx-background-radius 0
    -fx-border-radius 0
}

#exit:hover{/*鼠标事件：划过*/
    -fx-background-color: Gainsboro/*略深的灰色*/
}

#exit:pressed{/*鼠标事件：按压*/
    -fx-background-color: GhostWhite/*浅浅浅灰*/
}

#register{/*默认*/
    -fx-background-color: Transparent/*透明*/
    -fx-background-radius 0
    -fx-border-radius 0
}

#register:hover{/*鼠标事件：划过*/
    -fx-background-color: Gainsboro/*略深的灰色*/
}

#register:pressed{/*鼠标事件：按压*/
    -fx-background-color: GhostWhite/*浅浅浅灰*/
}

#verify{/*默认*/
    -fx-background-color: Transparent/*透明*/
    -fx-background-radius 0
    -fx-border-radius 0
}

#verify:hover{/*鼠标事件：划过*/
    -fx-background-color: Gainsboro/*略深的灰色*/
}

#verify:pressed{/*鼠标事件：按压*/
    -fx-background-color: GhostWhite/*浅浅浅灰*/
}